Method of melting and spraying fusible substances.



F. HERKIENRATH. METHOD OF MELTING AND SPRAYING FUSIBLE SUBSTANCES. APPLICATION FILED JULY 6, 1914.

Patented Oct. 26, 1915.

.iw 11111111411111wmllllzlzlzmM14 affn MMI? more economical to use a separate blast dernAlvz nnnKnNnA'rn, or ,zunrcn, swrrznnLAnn, .Assrenon, BY MnsnnAssrennears, r0 MErALs coArrne COMPANY or AMERICA, or nosron, ssnonusn'r'rs,

A CORPORATION OF MASSACHUSETTS.

METHOD OF MEL-TING: AND SPRAYINGr FUSIIBLE SUBSTANCES.

Specification of Letters Patent. Patented. 248, i915.

Original applicationfiled March 31, 191 Serial no. 826,137. Divided. am this application filed Jl'uly e,

- 19M. SeriaINo. amen To all whom it may concern Be it known that I, FRANZ HERKENRATH, a citizen of the German Empire, residing at Zurich, Switzerland,'have invented certain new and useful Improvements in the'Methods of Melting and'Spraying Fusible Substances, of which the following is a specific'ation.

This invention relates to an. improved the present invention has been divided out.

from my application Serial No. March 31st 1914.

. To this end-I use a stream of heated gas, in the path of which I place the fusible 826,137 filed substance, the temperature of the gas beingsufficiently high to melt the substance. The

functionpf the gas is thus in part analogous to that of the blow pipe flame used in' some forms of metal spraying but the gas. also. assists in subdividing the molten substance and projecting it at the requisite. velocity to forman impacted coating. It is usually vice. acting infconjunctionwith the stream of hot gas as in such a case the required env ter bycollars m, a and by; a holder is which 'ergy of spraying blast may be obtained without heating an excessive quantity of" spraying gas. c

Suitable apparatus for carrying this improved method into efiectare. shown in the accompanying drawings, in Figures 1, '2, 3 and 4: respectively, parts of the apparatus in all the views being shown in section.

Referring in the first instance to Fig. 1,

a designates a coiled tube of electrically conductive but resistant material, and b a feed pipe through which a stream of gas is supplied to the tube oz so that the gas issues from the'tube at 0. Around the discharge end 0 of the tube a, and concentric therewith, is an annular blast nozzle dto which is fed a stream of gas through a pipe e. Electric current is fed through the tubea by means of wires to and heats the said tube sufliciently to raise the gas therein to the arod or temperature required for melting wire f of the fusible substance he d in front of the nozzle andfedforward through a guide 9 at the rate required.

The concentric arrangement of-the hot and cold blasts has the effect that the substance is' melted by .a relatively small quantity of air or gas while the blast which supplies the necessary energy for subdivision and projection does not require to be heated and does not interfere with the proper melting of the point of the fusible substance which is preferably fed forward in wire or filamentary form.

In the modification shown in lzig. 2 atube a of refractory material incloses an electric resistance b, through which current is fed by mean-3 0f wires to. A stream of gas is fed intc' the tube w by means of a pipe 6 and parses out through a short pipe 5 the discharge end of which is surrounded by an annular blast nozzle 03 The stream of gas flowing tjtrough the tube a is heated --by the resistance 6 to the temperature required for melting the fusible substance.

In the modification shown in Fig. 3 a

tube a of refractory material such as carbon, graphite, carborundum or the likeis partly inclosed by a metal tube 72 into which a stream of gas is fed through a pipe 12 The-tube a which projects at c from the tube 6 is electrically insulated from the latin the wall of the tube a, so that the stream of gas fed through the pipe 6 into the interior r of thetube b passes through the ducts d into the tube a and is discharged from the latter outside the tube 6". The

an annular blast nozzle d. Electric current is fed through the tube a? by means of wires to and connections w", so that the tube becomes hot and heatsthe gas passing therethrough to the required temperature. temperature of 2000 Cfcan easily be attained with this arrangement, and gas can be fed throughthe tube a at high pressure withoutrisk of bursting the same, as the pressure outside the said tube is equal to that inside.

outer end'c of the tube a is surrounded by melted and sprayed is fed. The jtube a and the granular carbon therein are heated by a burner 27. Combustible or non 'combustible. gas may be used which acquires re-- ducmg properties by contact with the carbon in the tube a i \Vith the appliance shown in Figs. 1, 2 and 3, I preferably use gases of a chemically neutral or reducing quality in.order to prevent oxidation of the electric conductors and of the substance melted. I 3 z I claim: 1

1. In the method of melting'and spraying a fusible substance, the step which consists in simultaneously subjecting the substance to a blast of unignited gas heated to a tem: perature above the melting point of said substance and at a pressure sufliciently high to disintegrate and project said substance while melting, and directing a separate blast on the fused portion of said substance.

2. In the method of melting and spraying a fiisible substance, the step which consists in subjecting the substance to a blast of chemically neutral unignited gas heated to a temperature above the melting said substance and at a pressure su ciently high to disintegrate and project said substance while melting.

3. In the method of melting and spraying a fusible substance, the step which consists in subjecting the substance to a blast of chemically neutral unignited gas heated to a temperature above the melting oint of said substance and at a pressure su ciently high to disintegrate and project said substance while melting, and directing a separate blast on the fused portion of said substance.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

FRANZ HERKENRATH.

Witnesses CARL GUBLnn, FRANK Bonn.

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